Comment You don't have to do it all at once ! (Score 1) 712
I don't know the exact numbers, but let's assume you change your roof every 20 years, so 5% of houses will get their roof replaced this year, lets ask/push people to use lighter shades (or white), probably same cost (just replaced my roof, color didn't affect price to me, so I assume doesn't affect supply cost), in 20 years, it's all replaced (not centuries !)